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Pinout on Speedometer

Does anyone know the pinout for the 8 pin plug that goes into the speedo?
My manual shows a lot of stuff but that isn't documented. I expect it will be the same on all M-12 and M-400 cars.

What is the minimum switching voltage needed for the Speedo to measure. I good strong pulse from the speed sensor. I expect anything between 5V and 12 V should be enough ....but it would be nice to know for sure. My speedo seems to be dead.

Gregg,
What did you find? I would be curious how all the gauges are wired and couldn't find any thing in the assembly manual either. The speedo gauge is a Caerbont Automotive Instruments part. I suspect the others are too. They are located in Wales, UK. Google for details or